Tapering mechanism



June 18, 1935. G. M, PELTON 2,005,387

TAPERING MECHANISM Original Filed Aug. ll, 1950 2 Sheets-Sheet l Si 'mwmfoz I am attozwmj June 18, 1935. Q M PELTQNl v 2,005,387

' TAPERING MECHANISM l Original Filed Aug. 1l, 1950 2 Sheets-Sheet 2 Patented June 18 1935 PAT TAPERING MECHANISM I George M. Belton, deceascdjlate of Milwaukee',`

Wis., by Herbert W. Knox, administrator, vMilwaukee, Wis.,.assignor'tol Thev Filer & Stowell u Company, Milwaukee, Wis., a corporation Original application August `11, 1930,`Seria1No. 474,583. Divided and this application July 20, 1931, Serial No. 552,003

s claims. (o1. 121-445) -rThis invention is directed to `an improvement in tapering mechanisms for saw mill machinery, wherein the taper movement of the knee may be selectively controlled at will.

The primary-object of Athe invention is the provision of a tapering mechanism through which the knee maybe moved relative to the head block for a unit taper distance or for any one of several multiples of such unit taper distance through the provision of power mechanism of simple and compact form. .A further object of the invention -isthe utilization in such taper mechanism of means for cushioning the movement of the knee under in- 161 itial log-impactv whereby to absorb thej'ar of such impact to avoid undue strain and possible breakage ofthe parts. c

AThe 'invention is illustrated in the accompanying drawings, whereinz Figure l is a side elevation'of the tapering mechanism in applied position. y l -f Figure 2 isa longitudinal section through the tapering mechanism.

Figure 3 is a view similar to Figurefz, showing the position of the parts following the operation of the pressure piston.

Figure 4 is a View similar to Figure 2, showing the position of the parts following the initial operation of the pressure piston and the subsequent' operation of the `limiting piston.

Figure 5 is a view similarA to Figure 2, showing theposition of the parts following the operation of the operating piston. l

The present invention contemplates the use of tapering mechanism wherein a knee, irrespective of the position of the dogs, maybe moved trans- Versely of thel carriage independently of the set works in order that such knee may accommodate itself to the irregularformation of the log in order that a proper sawing operation may be had. This taperingmeans, as illustrated in the A hollow piston 'i4' is mounted within and adapted for sliding cooperation with the .forward portion of the cylinder 1U, the rearward movement of this-piston .being4 limited byl a shoulder 'l5 on the interior of' the` cylinder. The piston '14 lis formed with a transverse wall 'I8 andwith a'rearwardly extending skirt Tl terminatingV in :a1 piston disk "I8 hereinafter termed the operating piston which, through the medium of appropriate piston'rings, has ka g sealing sliding t with the interior of the cylinder 1U. A 1 ,o y

, Thewall 'i6 of piston M hasa rearward,4 sleevelike extension 19 in which isslidably'tted a hollow, sleeve-like .extension projecting rearwardly from` a power pistonll which has a sealing sliding twith the piston 'i4 and which is limited in its movement outwardlyof said pis-- ton, as at 82. link 83 with the knee I."

Arranged'in the cylinder l'Hl rearwardly beyond the piston disk 78 is a piston disk ,84here- The piston 8l is connected bya inafter termed the limiting piston arranged for' sliding sealing cooperation with the cylindeif'ltl` and carrying a piston rod't' which projects for-if wardlyV of the piston diskiii and extends loosely through an opening in the piston disk'lfand terminates in a head* 8S 'having a diameter'A greater than that of thefinterior of the sleevelike extension 19. -The opening in the piston disk 'i8 throughwhich the rod35 extends issurround- `ed by a sleevel, the interiordiarneter of which is suflicient'to receive the head 86. The' piston rod extends in the opposite direction from'fthe piston disk S4 relative to the head 86 andthrough the end ofthe cylinder, as at 88, and `terminates in an'enlargement 89.

Between the piston disk 84and the proximate end of the cylinder,'that is, therear end, is arranged a third piston disk hereinafter termedV the pressure piston having a sliding sealing fit with the cylinder l0 andv centrally of which piston disk 9B there is secured a sleeve 9i ywhich snugly` and slidably ntsthe piston rod extension 88 and terminates'in a head ,92. The end wallvof the piston has a guiding extension for the sleeve Si, as at 93, which extension is Iformed witha channel 94 of an interior diameter suicient to` receive the head 92 and of a predetermined depth to` limit thereby the movement of the headtecent the piston disk 18. The transverse wall 1S of the hollow piston 'Il is also formed with openingsY 91 so that air under pressure fills the space i within the skirt 11 and between the wall 1B and `The end wan of the cylinder is formed with.

a port 98 which opens to the interior of the cylinder beneath the piston disk90 so that in the operation of this disk the disks 84 and 18 are correspondingly operated. The head 92 of the sleeve 9| is formed with a port 99 for the admission of air under pressure, which air passes longitudinally of the sleeve 9| about the piston rod 88 and engages beneath the piston disk 8l. to thereby move said disk longitudinally of the cylinder and with it the piston disk '|8.v The head orenlargement 89 of the portion 88 of the piston rod is formed with an inlet port |00 for air under pressure which communicates with a central, longitudinally extending channel IDI formed in thepiston rod 88, which channel communicatesfwith a. diagonal passage |92 formed in the piston disk 84 and opening beneath the piston disk 18 so that under pressure through the port |08 the piston disk 18 and parts connected thereby are alone moved.

Assuming that the limit movement permitted the head' 92 is the unit of movement for taper purposes, say 11/2", then the limit of movement permitted the enlarged terminal 89 of the piston rod 88 before such enlargement contacts with Vthe head 92 Vwill be twice this unit or 3". The

movementpermitted the piston disk I8 by the head- 86 is also 3". Pressure, therefore, is admitted through the port 98 to directly operate the piston disk 98, and the parts including the piston 8| connected to the-knee will be moved until the head 92 is stopped by the extension of the rear wall of the cylinder, that is, 1%.

AIf pressure is admitted through the port 99 to directly operate the piston disk 84, then the parts will be moved until the enlargement 89 of the piston rod 88 engages the head 92 of the sleeve 9|, that is, 3". If air is admitted simultaneously through the ports 98 and 99, the movement of the piston disk 90 through the 11/2" permitted by the limit movement of the head 92 will `thereupon space that head from the enlargement 89 of the piston rod 88 a distance of 4%" so that the pressure admitted through the port99 will move the piston disk and the corresponding parts of the taper mechanism a distance of 41/2".

Therefore, under pressure admitted through the'port 99, the piston disk 84 will engage piston YI8 and move the hollow piston 14 and connected parts 3" for correspondingly moving the knee a like tapering distance. If pressure is admitted through the port |00, the piston disk 'I8 is operated to `the limit permitted by the head 86 and thus the corresponding parts of the mechanism are moved a vdistance of 3" for tapering movement of the knee to this extent.

If now pressure is ycorrespondingly admitted through ports `89 and |80, the piston disk 84, moves the parts 3" and the piston disk 'i8 will correspolridingly` move the parts a further 3". Thus a taper of 6" for the knee is secured. 1f pressure is simultaneously admitted through the ports 98, 99 and |88, it is quite apparent that the piston disk 98 will move 11/2, permitting a movement of the piston disk 84 to L11/2" or 3" farther than the movement of the piston disk 90, and the piston disk 18 will be moved a further 3" or 7l/2 complete movement of the parts connected with the knee and insuring a corresponding 71/2" taper movement of the knee. Thus, by controlling the air pressure to the particular ports desired, the taper mechanism and thereby the knee may be moved a distance of 11/2 or any of the several multiples thereof up to 'l1/2".

Of course, the unit of movement arbitrarily indicated as 1%" may be obviously any unit, and thus the knee may be selectively tapered to the'particular unit or any of the several multiples thereof in a simple, expeditious manner. On release of the operating pressure, the constant pressure through the inlet 95 will return all parts to normal or non-tapering position, as will be obvious.

This application is a division of application filed August 11, 1930, Serial #474,583, and issued as Patent No. 1,853,775 on April l2, 1932.

What is claimed is:

l. In a tapering mechanism a cylinder, a power piston in one end of said cylinder, three pistons arranged at the opposite end of the cylinder, the rst of said pistons being normally in contact with the end of the cylinder, the second of said pistons overlying and normally in contact with the first piston, the third of said pistons overlying and normally in contact with the second piston, means carried by the rst piston to engage the cylinder in the operation of that piston and limit the movement of the piston, means carried by the second piston to engage the limiting means carried by the first piston in the movement of the second piston to thereby limit the movement of the second piston, means carried by the second piston to limit the movement cf the third piston, and means for selectively admitting fluid under pressure between the first piston and the end of the cylinder, between the rst and second pistons and between the second and third pistons, the movement of any one of said pistons being communicated to the power piston.

2. In a tapering mechanism a cylinder, a power piston in one end of said cylinder, three pistons arranged at the opposite end of the cylinder, the rst of said pistons being normally in contact with the end of the cylinder, the second of said pistons overlying and normally in contact with the first piston, the third of said pistons overlying and normally in Contact with the second piston, means carried by the` first piston to engage the cylinder in the operation of that piston and limit the movement of the piston, means carried by the second piston to engage the limiting means carried by the first -piston in the movement of the second piston to thereby limit the movement of the second piston, means carried by the second piston to limit the movement of the third piston, means for selectively admitting fluid under pressure between the first piston and the end of the cylinder, between the rst and second pistons and between the second and third pistons, the movement of any one of said pistons being communicated to the power piston, and means for admitting fluid under pressure between the third piston and the power piston.

3. In a tapering mechanism a cylinder closed at one end and open at the other, a power piston operative in the open end ofk the cylinder, a sleeve movable in the cylinder and slidably receiving and guiding said piston, three pistons arranged in the cylinder beyond the end of the sleeve, the first piston being normally in contact with the closed end of the cylinder, the second piston being normally in contact with the rst piston, the third piston being normallyin contact with the second piston and in engagement with the end of the sleeve, a piston rod extending from the second piston beyond the closed end of the cylinder and formed with a limiting abutment, said rod extending forwardly within the cylinder through and beyond the third piston and serv-` ing as a limit for the movement of the third piston, a sleeve secured to the rst piston encircling said piston rod and extending beyond the closed end of the cylinder, said'piston sleeve terminating in an abutment to limit the movement of the rst piston and serve as a stop for the abutment of the second piston, a conduit for admitting air under pressure between the closed end of the cylinder and the first piston, a conduit in the sleeve extension of the iirst piston to admit air under pressure between the rst and second pistons, and a conduit extending longitudinally of the piston rod and opening between the second and third pistons to admit air under pressure between the second and third pistons.

4. In al tapering mechanism, a cylinder, a power piston therein, a plurality of independent auxiliary pistons controlling the movement of the power piston, said auxiliary pistons including an operating piston, a limiting piston-and a pressure piston, means for admitting pressure to the cylinder for selectively operating said auxiliary pistons, a cylinder-engaging stop carried by the pressure piston to limit the yoperative movement thereof, a stop carried by the limiting piston to engage the stop carried by the pressure piston to limit the operative movement of the limiting piston in accordance with the position of the stop of the pressure piston, and means carried by the limiting piston to determine the limit movement of the operating piston.

5. In a tapering mechanism, a cylinder, a power piston therein, a plurality of independent auxiliary pistons controlling the movement of the power piston, said auxiliary pistons including an operating piston, a limiting piston and a pressure piston, means for admitting pressure to the cylinder for selectively operating said auxiliary pistons, a cylinder-engaging stop carried by the pressure piston to limit the operative movement thereof, a stop carried by the limiting piston to engage the stop carried by the pressure piston to limit the operative movement of the limiting piston in accordance with the position of the stop of the pressure piston, and means vcarried by the limiting piston to determine the limit er'piston therein, an operating piston movable inthe cylinder for actuating the power piston, a limiting piston in the cylinder and arranged beyond the operating piston and normally incontact therewith, means carried by the limiting piston to limit the operative movement of the operating piston, a pressure piston arranged in the cylinder immediately beyond and normallyr in contact with the limiting piston, means carried by the pressure piston to limit the operative movement thereof, means carried by the limiting piston to cooperate with the limiting means of the pressure piston to limit the operative movement of the limiting piston, and means for admitting pressure for selectively operating the pressure piston, limiting piston or operating piston. i

7. A tapering mechanism including a pressureoperated means for selectively providing variable taper distances, said means including a cylinder and a plurality of taper-controlling pistons movable in the cylinder, said pistons including an operating piston, a limiting piston and a presthereof, a stop carried by the limiting piston to engage the-stop of the pressure piston to limit Y the operative movement of the limiting piston, and a second stop carried by the limiting piston for limiting the operative movement of the operating piston.

8. AV tapering mechanism including a pressureoperated means for selectively providing variable taper distances, said means including a cylinder and a plurality of taper-controlling pistons movable in the cylinder, said pistons including an operating piston,- a limiting piston and a pressure piston .arranged in axial alignment, means for admitting pressure between thie cylinder and the pressure piston to operate the latter, means for admitting pressure between the pressure piston and limiting piston to operate the latter, means for admitting pressure between the' limiting piston and operating piston for operating the latter, va cylinder-engaging stop carried by' the pressure piston to limit the operative move-Y ment thereof, a stop carried by the limiting piston to engage the stop of the pressure piston to limit the operative movement of the limiting piston, and a second stop carried by the limiting piston for limiting the operative movement of the operating piston, the limit of the operative movement of the limiting piston being dependent upon the position of the stop of the pressure piston and the limit of operative movement of the operating piston being determined by the piston of the second stop of the limiting piston.

` HERBERT W. KNOX, iL. s] Administrator of the Estate of George M. Felton,

Deceased. f 

